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| Author |
Message |
paclark
Joined: 02 Mar 2004
Posts: 4
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| COG-LCD Display Issue |
 Posted: Wed Jul 21, 2004 3:55 pm |
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I'm using the basic 4-bit LCD write function and for some reason with a COG-LCD any chars after the 10th position are reversed. Anyone seen this? Probably simple but I can't figure it out. I can switch to two other 2x16 displays and they work fine. The LCD is from Varitronix and the controller is a Fuji FC2314AK (I assume HD44780 compliant).
| Code: |
//******************************************************************************
void LCD_SetPosition ( unsigned int xVar )
{
LCD_SetData ( swap ( xVar ) | 0x08 );
LCD_PulseEnable();
LCD_SetData ( swap ( xVar ) );
LCD_PulseEnable();
}
//******************************************************************************
void LCD_PutChar ( unsigned int xVar )
{
output_high ( LCD_RS );
LCD_SetData ( swap ( xVar ) ); // send high bits
LCD_PulseEnable();
LCD_SetData ( swap ( xVar ) ); // send low bits
LCD_PulseEnable();
output_low ( LCD_RS );
}
//******************************************************************************
MAIN:
LCD_SetPosition ( LINE_1 + 0);
printf (LCD_PutChar, "1234567890abcdefghij");
LCD_SetPosition ( LINE_2 + 0);
printf (LCD_PutChar, "1234567890abcdefghij");
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Displayed Result:
As you can see I have to enter more than 16 chars before wrap begins.
Any thoughts?
Regards,
Patrick Clark |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Wed Jul 21, 2004 4:37 pm |
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| What's the part number of the Varitronix LCD ? |
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paclark
Joined: 02 Mar 2004
Posts: 4
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Mark
Joined: 07 Sep 2003
Posts: 2838
Location: Atlanta, GA
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| Posted: Wed Jul 21, 2004 5:29 pm |
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Looks like they wired the 2nd half of the display backwards!
I hope it was cheap LOL |
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treitmey
Joined: 23 Jan 2004
Posts: 1094
Location: Appleton,WI USA
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| Posted: Thu Jul 22, 2004 8:26 am |
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Send it back and see how they repond.
Maybe it was a one time mistake.
I know how risky this design stuff is.
I had to order $50 240x64 graphic LCD from hantroncs.
I only had 1 to play with. And our order on 100 had a 13 week lead time.
If anything was wrong,.. I would have been in big trouble. |
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